Window burglar alarm



1951 c. M. BARTRAM WINDOW BURGLAR ALARM 2 SHEETS-SHEET 1 Filed Dec. 7, 1948 INVENTOR C. M Bax-[ram ATTORNEYS Dec. 4, 1951 Filed Dec. '7, 1948 C. M. BARTRAM WINDOW BURGLAR ALARM 2 SHEETS-SHEET 2 INVENTOR C, M..Bar2fram BY I ATTORNEYS Patented Dec. 4, 1951 UNITED STATES PATENT QFFKCE WINDOW BURGLAR ALARM Carl Bartram, Chico, Calif. Application December 7, 1948, Serial No. 63,865

This invention relates to burglar alarm devices for windows; my principal object being to provide a device of this character adapted to be mounted in connection with an ordinary residential double-hung sash Window,

ever the lower sash is raised or the upper sash is lowered.

Another object is to provide a device for, the purpose in which the alarm given is of such a nature that its functioning will tend to frighten away a would-be intruder so that he will desist in his attempt to enter.

A'further object is 'to provide an alarm device which may be set at any desired adjustable point in the height of the window, and which will permit either the upper or the lower sash to be initially opened a predetermined amount, as is desirable for ventilation, without interfering with the functioning of the device should an attempt be made to open either sash further.

A further object of the invention is to provide a practical and reliable burglar alarm for windows, and one which will be exceedingly effective for the purpose for which it is designed.

and which when properly set Will give an audible alarmv when- 1 Claim. (Cl. 116-87) These objects are accomplished by means of such structure and relative arrangement of parts as will fully appear by a perusal of the following specification and claim.

In the drawings:

Fig. 1 is a fragmentary sectional elevational outline of a double-sash window showing the burglar alarm device mounted in connection therewith and in a set or cooked position.

Fig. 2 is a similar view showing the device tripped to give the alarm.

Fig. 3 is a back view of the device, detached.

Fig. 4 is an inner edge elevation of the same.

Referring now more particularly to the characters of reference on the drawings, the device comprises a rectangular, relatively shallow housing i, the front of which is closed by a removable cover plate 2, which is left off in Figs. 1 and 2 to show the interior mechanism.

A rigid flange 3 projects from the rear of the housing at its outer side, and a similar flange 4, parallel to the flange 3, is disposed intermediate the side edges of the housing. The flange is rigid with a lateral base bar 5 slidably guided on the'back of the housing for lateral movement, and engaged by a spring urged lever B which is pivoted on the back of the housing below the bar and projects above the housing for manipulation by the operator. I

The flanges are arranged to project into the window casing groove for the lower sash I; the flange 3 then engaging the parting bead 8, and the flange 4 engagingthe inner framing member of the casing. To mount the housing in place, the flange i is initially retracted somewhat by a lever movement to enable the flanges to fit the respective casing members, so-that when the lever is released the housing is frictionally held in place and may be easily moved up or down the sash groove to whatever position may be desired, and according to the extent the lower sash is to be open, without actuation of the alarm.

The alarm mechanism of the device is disposed within the housing and is arranged as follows: 7

Fixed in the housing at its inner side wall It! is an anvil Ii adapted to support a percussion cap I2, which is placed on said anvil through an opening I3 in the sidewall Ii]; the opening l3 being closed by a slide gate I4.

A hammer l5 to engage the cap is pivoted, as at' H5, in the housing, a spring 11 being applied to the hammer and tending to lower the same sharply.

A finger l8 extends from the hammer substantially radial with the pivot l6, and is normally engaged by a shoulder i 9 formed in a holding bar 20 which is pivoted, as at 2|, in the housing and is disposed with an upward slope to the inner wall 10 of said housing.

A spring 22 acting on said bar tends to maintain the shoulder in engagement with the finger l8.

A horizontal trip lever 23 is pivoted, intermediate its ends as at 24, in the housing below the lower end of the bar 20, and is formed with an u standing lug 25 at its laterally inner end, while a uided arm 26 upstands from the opposite end of the lever.

A trigg r lunger 2'! de ends from the housing in o the path of opening move ent of the top of the lower sash T. and is gui ed for v riical movement in a seeve 28 in the housing, the punqer heim pos t oned to en aw the under side of the lever 23 a jacent the lug 25. or at a point latera ly outward of the ever pi ot 24.

Another horizontal +r ger member 29. yieldably advanc d by a s ring 30, projecs from the outer side of the housing and is provided on its outer end with a cush on head 3i adapted to frictionalv engage the adjacent side frame of the upper sash 32. The member 29 is d sposed above the bar 20 and is slidab e in a sleeve 33 pivoted in the housing, as at 34, so that said member may swing up and down in a vertical plane, the outer side wall of the housing being vertically slotted to allow of such movement. At its inner end the sleeve is provided with a depending lug 35 positioned to engage the adjacent or inner end of the bar 20.

It will thus be seen that if the lower sash is raised or opened until it engages and lifts the plunger .21, the bar 29 will .be swung up about its pivot'i2 I This releases the hammer fingerl'B, and the hammer will drop, urged by the spring i1, and said hammer will detonate the cap l2, giving an audible alarm and one which will simulute the shooting of a firearm. Similarly, if'ithe member 29 is swung up by a slight upward movement of the upper sash 32, the lug 35 will'be depressed and the bar 29 willbe .swunginaihammer releasing direction. If the sash 32 is lowered or opened, the member29 will be swung down, engaging and depressing the arm 26, and swinging the lever 23 in the same direction, and with the same result, as When said lever is thus moved by the plunger 21.

Once the hammer is released and the alarm given, the hammer is reset by merely lifting up on a finger 3'5, which is rigid wi'h, and projects from, said hammer-through a slot 31 in the housing. The door M islowered, exposing-the anvil for-the removal of the detonated cap and the insertion of a fresh one.

Since the holding or clamping means of the housing enables the same to'be readily mounted at any desired position in the height of the window casing, the lower sash may be opened to any desired extent for ventilation before the alarm will be actuated. Similarly, the upper sash may be opened to any desired extent, if this is done before the device'is mounfe'd'in place.

From the foregoing description it-will be readily seen that therehas been producedsucha device as substantially fulfills the objects of the-invention, as set forth herein.

While this specification sets forth in detail the present and preferred constructionof the device,

still in practice such deviations from such detail may be resorted to as do not form a departure from the spirit of the invention, as defined "by the appended claim,

'path of and cooperating with the hammer element; a holding bar pivoted intermediate its ends in the housing above the hammer, means between the hammer and bar normally holding the hamm'er'cocked but arranged so that the hammer will be released upon upward movement of one end of the bar and corresponding downward :movementof the zother end thereof, means including ,a lever functioning upon upward movement of the lower sash to move said one end of the bar upwardly, a spring-advanced trigger member projecting from the housing transversely of the upper sash'to'frictionally engage the-same, means mounting the trigger member for up and "down swinging movement, means between the trigger member andlever to cause the latter to be moved in a direction to move said one end of the bar upwardly upon downward swinging movement of the trigger member, and means between the triggermember and bar to move said one end of the bar upwardlyupon upward swinging movement of said trigger member.

CARL M. BARTRAM.

REFERENCES CITED The following references are of record inthe file of this patent:

UNITED STATES PATENTS Number Name Date 559,981 Knapp .May 12, 1896 663,101 Ritchie Dec. 4, 1900 811,061 Hill Jan.'30, 1906 903888 Rycra'ft Nov. 17, 1908 1,281,274 Berry "Oct. 15, 1918 1,701,494 Budean Feb. 12, 1929 1,849,918 Fisher et"al.. ...l. Mar. 15, 1932 

